Practice Questions

(i) The volume of air that will remain in the lungs after a normal expiration is called residual volume. (FALSE)
Correction: This is actually the Functional Residual Capacity (FRC).

FRC is the sum of Expiratory Reserve Volume (ERV) and Residual Volume (RV).

Residual Volume (RV) is specifically the volume of air remaining in the lungs even after a forced (maximum) expiration. You can never truly empty your lungs of this air.

(ii) Volume of air inspired or expired during a normal respiration is called tidal volume. (TRUE)
Tidal Volume (TV) is the amount of air that moves in or out of the lungs during a quiet, relaxed breath.

In a healthy adult, this is approximately 500 mL.

(iii) The maximum volume of air a person can breathe in after a forced expiration is called vital capacity. (TRUE)
Vital Capacity (VC) represents the maximum amount of air a person can expel from the lungs after a maximum inhalation, or conversely, the maximum they can inhale after a forced exhalation.

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